Eaton have added a number of new features to its M-MAX variable speed drives including EMC filtering options, configurable analogue inputs and enhanced fieldbus connectivity. The M-MAX drives are available with ratings up to 7.5kW, and can be configured by the user for either V/f or sensorless vector control. This makes them well suited for energy saving fan and pump applications, and also for general industrial applications where accurate speed control is needed.

Monitoring and configuration is done using a built-in display and operating unit, while accurate speed setting is achieved using an electronic setpoint potentiometer. Support is now also provided for users to set up and store two separate parameter sets, with switching between the two sets controlled by a signal to one of the drive’s digital inputs.

Additional features of the drives include a 1.5x short term overload capacity, flying start feature, PID functionality and, on larger units, an integrated brake chopper. As standard, M-MAX drives feature a built-in EMC filter that provides compliance with Categories C2 and C3 of IEC/EN 61800-3. They can also be supplied in filter-less versions for use with external filters to cater for special applications, such as those where C1 compliance is needed or where earth leakage must be minimised.

Six digital inputs, which can be set by the user for positive or negative logic, are provided, together with one transistor and two relay digital outputs, two analogue inputs configurable for voltage or current operation, and one analogue output. These I/O facilities mean that, in many applications, the M-MAX drive can provide all of the control logic required, eliminating the need to use a separate programmable controller or intelligent relay.

M-MAX drives have an RS485/Modbus interface. However, options are now available to extend their connectivity so that they can interface directly with other types of fieldbus system, including CANopen, PROFIBUS DP and DeviceNet.